Reducing data acquisition, power and processing for hemodynamic signal sampling

Abstract

Methods, systems and devices are provided for reducing the amount of data, processing and / or power required to analyze hemodynamic signals such as photoplethysmography (PPG) signals, pressure signals, and impedance signals. In response to detecting a specific event associated with a cyclical body function, a hemodynamic signal is continuously sampled during a window following the detecting of the specific event, wherein the window is shorter than a cycle associated with the cyclical body function. The hemodynamic signal is then analyzed based on the plurality of samples. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

Description

PRIORITY CLAIM[0001]This application is a Divisional Application of and claims priority and other benefits from U.S. patent application Ser. No. 10 / 894,962 (Attorney Docket No. A04P3010-US3), filed Jul. 19, 2004, entitled “REDUCING DATA ACQUISITION, POWER AND PROCESSING FOR HEMODYNAMIC SIGNAL SAMPLING”, incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]Embodiments of the present invention relate to reducing the amount of data, processing and / or power required to analyze hemodynamic signals such as photoplethysmography signals and arterial pressure signals.RELATED APPLICATIONS[0003]The present application is related to the following commonly invented and commonly assigned patent applications, each of which was filed on the same day or has the same priority date as the present application, each of which is incorporated herein by reference:[0004]U.S. patent application Ser. No. 10 / 897,336 entitled “Reducing Data Acquisition, Power and Processing for Photoplet...

AI Technical Summary

Benefits of technology

The present invention relates to methods and systems for reducing the amount of data, processing, and power required to analyze hemodynamic signals such as photoplethysmography and arterial pressure signals. The invention involves obtaining a measure of DC offset and pulse amplitude associated with a received light signal, and using a two dimensional look-up table to determine the O2 saturation level based on the normalized light pulse amplitude. The invention also involves transmitting light of different wavelengths to a light detector, and sampling the light signals to determine the DC offset and pulse amplitude, followed by high pass filtering to reduce data production. The technical effects of the invention include reducing the amount of data required for analysis, reducing processing requirements, and improving accuracy in determining O2 saturation levels.

Problems solved by technology

This relatively high sampling rate and relatively intensive filtering consume battery power and processing resources.

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